A courthouse security officer stands at the south entrance to the Riverside Hall of Justice following a bomb threat on Thursday, Jan 19, 2012.

People stand across the street from the south entrance to the Riverside Hall of Justice following a bomb threat on Thursday, Jan 19, 2012.

Riverside County Sheriff's Department officers use a bomb-sniffing dog as they walk the perimeter of the Historic Riverside County Courthouse following a bomb threat at the Riverside Hall of Justice on Thursday, Jan 19, 2012.

Riverside County Sheriff's Department officers gather the remains of the contents from a briefcase that was exploded by a bomb squad in downtown Riverside on Thursday, Jan. 19, 2012. The briefcase, which belonged to a legal courier, was abandoned inside the Riverside Hall of Justice after a bomb threat was received by authorities Thursday morning.

A bomb squad team member moves into position near the Riverside Hall of Justice in downtown Riverisde after a bomb threat was received by authorities on Thursday Jan. 19, 2012.

People gather behind police tape on Orange St. in downtown Riverside following a bomb threat at the Riverside Hall of Justice on Thursday, Jan 19, 2012.

Riverside County Sheriff's Department officers divert traffic on Main St. near the Riverside Hall of Justice following a bomb threat on Thursday, Jan 19, 2012.

Traffic on Main St. next to the Riverside Hall of Justice is nonexistent following a bomb threat on Thursday, Jan 19, 2012.

Los Angeles attorney Steve Revitz works on his laptop on12th in downtown Riverside following a bomb threat at the Riverside Hall of Justice on Thursday, Jan 19, 2012.

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